Internal-combustion engine



May 17, 1927. 1,628,894

E. H. MAUPIN v INTERNAL COMBUSTION ENGINE Filed April l, 1.925v 3 She'etS-Sheet 1 y P J I* `v *L \-1- l F1 ffff-li c a I l@ 'E' N :'a S l b :a

\ :a \n l' ab la E a o U t E a l? c a EHMaa/vz'fz, v jzl/efza/f WWW@ May 17 1927 E. H. MAUPIN INTERNAL COMBUSTION ENGINE Filed April 1. 1925 3 Sheets-Sheet 2 May 17 1927' E. H. MAUP'IN INTERNAL COMBUSTION ENGINE 3 Sheets-Sheet 3 Filed April 1. 1925 W Ww@ EDWARD H. Maurin,

Patented May 17, 1,927.

UNITED., .STATES PATENT orrlciaz.v

OF DALLAS, TEXAS,

PORATION, A CORPORATION OF TEXAS.

AS-SIGNOB TQ MAUPIN AUTOMOTIVE COR- INTERNAL-.'IOMBUSTION ENGINE.

AApplication llled April 1, 192.5. Serial No. 19,868.

My present yinvention relates to internal combustion engines, and in its broad aspect has reference, among other things, to improvements in means and apparatus for creating,.regulating and delivering the combustible char e to an internal, combustion engine, and t en disposing of the products` of combustion in an improved manner; and with 4reference 'hereto attention is directed tomy copending applications for patent serially numbered 16,729 and 16,730.

- More particularly it is my purpose to provide means whereby air is delivered under constant, but regulatable', pressure both to an'v improved mixing chamber and to Yan improved exhaust manifold device to the end that an effective combustible or explosive charge is formed without the .use of the conventional carburetor and the cylinders completely and quickly scavenged of the products of combustion'. ln' accomplishing this and other results I have provided a unique mixing chamber yarranged above the several cylinders and communicating therewith through single ports, and I have associated with said mixing chamber improved valve units for controlling thedeliveiy of fuel and air to the cylinders--the fuel and air both `being under pressure, and other valve devices for both controlling the delivery of the combustible or explosive charge to the cylinders, and feeding thereto a sup ly of pure air under pressure subsequent to t e i ition of the charge whereby to effective y and quickly scavenge the cylinders in cooperation with a constant air draft developed in the/manifold. Furthermore, I have provided means whereb the combustible or explosive charge is e ectively 'mixed and forced (instead of bein drawn bysuction) into the, y respective cylin ers of the engine, and then subsequently and through `the same port `leading from each cylinder to the' mixing junction therewith automatic means lfor regulating the delivery of fuel to the mixing chamber, andthe delivery of charges to the respective cylinders; second, I adapt a single valve unit for both regulatin the delivery .of the combustable charge an subsequently delivering a draft of air to each' of the cylinders; third, I provide unique means in'. connection with the cylinders of my engine for releasing-spent gases whilethe live gases are functioning and before complete exhaust takes place; fourth, I, utilize an improved manifold ofthe type defined in my co-pending application Serial Number 16,730 whereby the spent gases or products of combustion are drawn by suction from the respective cylinders instead of being'forced therefrom by pressure as hasheretofore been the case;

fifth, I provide unique means whereby-the gases are drawn yfrom the cylinders from several ports, while at the same time fresh air is supplied to the respective cylinders` to com' letely and quickly scavenge the same; sixth, provide unique and positive valve seventh, I attain by much simpler apparatus than `has heretofore been used a positive, v

constant and effective timing of fuel delivery to the mixing chamber.

The `structural elements employed to accomplish the above and other results and objects will be hereinafter morefully described in detail and specifically pointed out in the claims appended hereunto and forming a part of this specification, but the scope of the invention may only be determined jby the limits defined in the claims In the accompan ing drawings,lwherein is illustratedthe -pre erred embodiment of my invention Figure 1 .is a side `elevation of a power.

plant assembly showing the arrangement and formation of my apparatus,

Figure 2 is a top plan view of a power plant assembly showing my apparatus Figure 3 is a sectional side view of my improved piston, cylinder, mixing chamber, and valve control assembly,

Figure 4 is a detail view of one unit of my i valve control assembly,-

Figure 5 is a top plan view of one unit'of my valve control assembly, and

re 6 is a view of 611e of my piston- Figu heads showing the recesses therein.

In the drawings wherein like characters of lll?) lll) control mechanism for myl devices, and; 50g

reference designate like or similar parts throughout the several views:-

A designates the cylinder block of an internal combustion engine of the type adapted for use with motor vehicles,-B the radiator, C the dash board of a motor vehicle, D a portion of the systemof circulation for cooling the engine, E the hood, and F the fan.

The fan F is mounted on a shaft (1) over which the fan belt (2) is trained. The shaft.

(2) is journalled in a support (3) and the entire fan assembly, including the shaft and upper portions of the fan belt and support, is carried in a housing (4) provided with an open front facing the radiator B. Leading from the housing (4) are pipes (5) and (6). The pipe4 (5) communicates with a double manifold (7 ),the respective sections4 (8) and (9) of which extend along each side of the cylinder block A. kThe pipe (6) communicates with a pressure tank v( 10) arranged adjacent the cylinder block. Since the manifold and pressure tank communicate with the housing (4) a constant draft of air is supplied to each, and such drafts` are controllable manually from the dash C by rods (11) and (12)y engaging respectively the lever arms (13) and (14) of suitable gate valves (not shown), one in the pipe (5) and the other in the pipe (15) leading from the pressure tank (10). The internal arrangement and method of operation of mymanifold (7) is similar to that described in my co-pending application Serial Number 16,730.

Formed in the top yof the cylinder block -A is a mixing chamber assembly (16) which communicates through ports (18) with each cylinder (19). The pipe (15) from the pressure tank (10) is of the plural outlet type and each branch (20) communicates with the mixing chamber (16) to supply a" draft of air under pressure thereto. The manifold sections (8) and (9) each communicate with the cylinders on opposite sides thereof through ports (21), and the pistons (22) are each recessed as at (23)-5-see Figure 6-to permit escape of the spent gases adjacent the walls of each of the cylinders and piston heads on the downward or power 'stroke of the pistons and before the ports (21). are uncovered. This releases or exhausts the spent ases in the portions of the cylinders reerred to while the live gases are still 'functioning (or expanding) to generate power. vAbove each cylinder/cand formed uponthe chamber (16) is a valve unit assembly housing 24, through which the spark plugs (25) extend-to the respective cylinders. Carried in a screw threadedopenings in the top wall of the mixing chamber 16) are plugs `(26) through which Shanks (27) of valves (28) extend. Each of the valves (28) seats as atv (29) to close one of the orts (18) and the Shanks thereof are provi ed each with a stop (43) with which communicates a or abutment collar (30) above which is arranged a spring (.31) rendered adjustable in tension by a mit (32). Each valve shank (27 is engaged by the forked or bifurcated terminal (33) of an arm (34); the/point of engagement being between the collar (30) and the spring (31). The arm (34) is a part of a valve control assembly for each cylinder comprising asupport (35) ou which the arm is pivote'd as at (36) and a finger (3 7) formed integral with the arm, spaced therefrom, shorter than the arm, and parallel thereto A common cam shaft (38) for actuating the respective valve units isprovided with a sprocket (39) over which is trained a silent chain (40) from a power element of the engine (not shown). Mounted on the cam shaft are a plurality of double cam elements, the respective cams of which are designated (41) and (42), one cam element for each valve unit, and the respective cams (41) are adapted to engage and actuate the respective arms (34) to positively seat the valves (28) while -the respective cams (42) are adapted to engage the respectiveflingers (37) to positively move the arms (34) downwardly against the collars (30) to open or unseat the valves (28). The springs (31) serve to normally retain the valves (28) on their `seats and are relatively light thereby differing from the valve springs now in use. The foregoing valve assembl7 is similar to that described in my co-pending application Serial Number 16,729.

Each plug (26) is formed with a chamber pipe (44) from the-'common fuely sup ly pipe (45). Fuel. is delivered to the cham er (43) under pressure from the tank (45), and leading from each chamber to the mixing chamber (16) is a port (46). A needle valve (47) controls each Aport (46), and all needle valves are connectedy with a common control rod (46a) leading to thev dash C so that the amount of fuel for each cylinder can be readily regulated to control the operation of the engine. Also mounted in each plu (26) is a valve (48) held v'normally seate by a spring '(48).. The valves `(48) control th deliver n' of fuel from ports (46), and are adapte to be opened or unseated by engagement of the arms (34) with their respectivle Shanks (49) after the manner ofpoppet va ves. f

In practice, -`the cams(41) and (42) operate to move the respective arms (34) and ngers (37) to'actuate in a positive manner the valves (28). The downward movement of tlrearms (34)J the valves (48) eing held seatedby springs (48)-\vhile the piston is in its exhausting cycle of operation with the orts (21) open, and a pure draft of air is tliierefore allowed to pass through the mixinvchamber (16) from the pressure tank (.101) and `thence Yto no 'v and the valves unseated to release fuel, v whereupon the air entering the mixing -actuation onthe arm (34).

chamber through port .(29) is enriched to -form the explosive charge whereupon the.

valves are closed by further movement of the cams, and ythe charge exploded at the termination ofthe compression stroke. Just prior to the uncovering of the exhaust ports by the'pistons, the recesses `therein permit escape of those spent .gases adjacent the cylinder walls and piston head while at the same time the remaining live gases continue to generate power to complete the stroke. While I have- 'here ldescribed an engine equipped withfmy apparatus as having a plurality of cylinders, it will be understood that my apparatus finds equally effective application with olie cylinder motors'. The typeof internal combustion engine herein def scribed with respect to its stages of operation is that of the two cycle ty e.

lfVhile the operation o my invention is believed to be apparent from the foregoing, it is pointed out that a constant draft of air is delivered by the fan F to the reservoir (l0) and manifold sections (8) and 'llie function of this draft in the manifold is to create a suction action on the ports (21) lo completely and expeditiously scavenge the cylinders,expedite exhausting from the manifold, prevent the formation of carbon monoxide and other deleterious gases,a'nd dispense with the use of muftlers. The body of air contained under pressure in the pressure tank (10) is'delivered to the compartments of the mixing chambers for re-delivery to the cylinders and for/forming the explosive charges. Therichnessl of the mixture can be regulated by adjustment of valves (47) or of the gate valve in the pressureline from the pressure tank. In practice both are usually adjusted to obtain proper fueling. The valves (47), y(48) and (28) are relatively independent structurally, but the valves (48) andy (28) both depend for Among other things, the purpose of my present valve assembly is tov renderboth the opening and closing of the valves positive in every way, and -to dispense with the heavy master springs utilized in present day motors. Special attention is invited to the simplicity ov my apparatus both in construction and operation. i

YWhile in the foregoing, there has been illustrated and described such combination and arrangement of elements 'as constitute the preferred embodiment of my invention, it is nevertheless desired to yemphasize the fact that interpretation of the invention should only be. conclusive when made in the light of the subjoined claims.

Having described my invention and its objects with such attention to detail as will thoroughly acquaint one skilled in the art with its construction. and advantages, I claim 1. The combination in an internal combustion engine, a mixing chamber communicating with the cylinders, plural exhaust inanifolds, means for constantly supplying a draft of air through the manifolds, means for supplying air under pressure to the mixing chamber, plural valve devices, one for each cylinder, and adapted to permit circulation of air from said last mentioned air supply means through the mixing chamber air through said exhaust means, means for supplying air under pressure to the mixing chamber, means for controlling the delivery of fuel to the mixing chamber, and means for alternately developing circulation of air from the last mentioned supply means through the vmixing chamber to the cylinders, and releasing the charge in the mixing chamber to the cylinders.

3. The combination in an internal combustion engine, a mixing chamber communicating with the cylinders, exhaust manifolds, f

independent air pressure lines serving respectively thel mixing chamber and the manifolds, means for controlling the delivery of fuel to the mixing chamber, and means for controlling and releasing the charge in the chamber to the cylinders and controlling the o eration ofthe pressure line with respect to t e mixing chamber.

4. The combination in an internal combus. tion engine, a mixing chamber communi- 'eating with Ithe cylinders, exhaust mani' llO folds, means for develo ing circulation of air, a housing about sai means, a pressure tank communicating with the housing and with the mixing chamber for delivering thereto air under pressure, a pressurel line connecting the manifolds with the housing. means for controlling the admission of fuel to the g mixing chambenand, means for releasing the char es from the mixing chamber to the cylin ers and developing circulation of air from the pressure tank, through to the mixing chamber, the cylinders.

5. The combination in an internal combustion en 'ne, a mixing chamber, exhaust manifol s, means for regulating the admxssion of fuel to the mixing chamber, means for positively forcing the charge from the mixing chamber to the cylinder, 'means for positively sucking the spent gases from the cylinder to the manifolds, and means for developing a circulation of air through the mixing chamber,to the cylinders.

6. The combination in an internal combustion engine, a mixing chamber, exhaust manifolds, means for regulating the admission of fuel `to the mixing chamber, air pressure t means for positively forcing the charge from the mixing chamber to the cylinder, and air pressure means in connection with the manifolds for sucking the spent fumes from the cylinder'to the manifolds.

7. The combination in an internal combustion engine, a mixing chamber-communicating with the cylinders, exhaust manifolds communicating with each cylinder through several ports, means for developing Y air pressure in the mixing chamber, means for developing a constant draft of lair through the manifolds,iand Valve means for permittin a circulation of air from the mixing cham er, through the cylinders to the manifolds. y

8. In an internal combustion engine, a mixing chamber, a valve unit for Vcontrollin the operation of the mixing chamber, sai

unit comprising a manually controllable needle valve for regulating the amount of fueldelivered from the fuel line to the mixing chamber` a sprin seated valve forreleasing such fue] to t e 'mixing chamber, a valve for delivering the charge from the mixing chamber' to the cylinder, an arm enfgaging said llst valve, double cams one for moving said arm to seat said last mentioned valve and the other to unseat the valve, and said arm adapted to engage the fuel release valve to unseat the same at a predetermined point in its path of movement. v

In testimony whereof, 1 affix my signature hereunto.

E. H. MAUPIN 

